Type RPDC Revirsible Direct Drive (exhaust/supply) Roof Ventilator
APPLICATIONS: American CoolAir Type RPDC ventilators are single units designed for both exhaust and supply. The fan unit is elevated above the roof curb, eliminating the possible damper clearance problem, and the backdraft damper should be mounted in the standard roof curb. The unit can also be specified less the fan component for use as a gravity ventilator.
CONSTRUCTION:Type RPDC PRVs incorporate Style C (direct drive) fan components: adjustable pitch cast aluminum airfoil propeller blades with alternate blades turned 180° and a double orifice attached to the fan panel. The result is essentially equal air movement abilities in either exhaust or supply mode. The exhaust capability is reduced slightly due to air flow restrictions imposed by the hood, even through the propeller performs equally in both directions. To prevent backdraft when the unit is not energized, a center pivoted, motorized damper is recommended. Fan could be reversed for use as air supply, or exhaust ventilator by changing rotation of the fan prop. The motor and prop are above the roof curb and accessibly though removable side access panel. The ventilators utilize cast alumoinum adjustable pitch blade assembly with cast aluminum hub mounted directly onto teh motor shaft. All ventilators have removable side panel for easy access to the motor-prop components.
MATERIALS: The RPDC assembly and curb cap are fabricated of heavy gauge steel. Dampers are constructed of aluminum. The roof curb is made of galvanized steel with fiberglass insulation. Painted parts are coated after the American Coolair five-stage pretreatment system prior to the application of the thermosetting epoxy powder paint with an average thickness of 3 mils, baked at 400°F for smooth and durable finish.
DIRECT DRIVE: Direct driven models use adjustable pitch blades for performance adjustment in the filed.
MOTORS:The American Coolair air-over-motor design provides extra capacity and economy because it serves to dissipate heat and thus increase horsepower capability. Totally enclosed motors are standard. Several alternatives, such as explosion proof motors, two speed, energy efficient motors and severe duty motors, are available. Only nationally recognized brand motors with nationwide service facilities are used.
WIRING: Type RPDC PRVs feature a conduit through the curb cap for convenience in connecting power supply. If a safety disconnect switch accessory is specified, it is mounted above curb cap and attached to the conduit for a rain-resistant connection and switch enclosure.
CERTIFICATION:All Types RP vntilators are listed under UL705 – E39944 by Underwriters Laboratory, Inc. to U.S. and Canadian safety standards. All products are certified and licensed by AMCA (Air Movement and Control Association International, Inc.), for both air and sound performance, as well as octave band sound power levels.